diff --git a/tell_me_your_secrets/__init__.py b/tell_me_your_secrets/__init__.py
index a33997d..55fa725 100644
--- a/tell_me_your_secrets/__init__.py
+++ b/tell_me_your_secrets/__init__.py
@@ -1 +1 @@
-__version__ = '2.1.0'
+__version__ = '2.1.1'
diff --git a/tell_me_your_secrets/__main__.py b/tell_me_your_secrets/__main__.py
index 9891035..ebcca35 100644
--- a/tell_me_your_secrets/__main__.py
+++ b/tell_me_your_secrets/__main__.py
@@ -137,7 +137,7 @@ def __init__(self, config_object: dict, search_path: str, use_gitignore: bool, p
                 module_logger.debug(f'Using gitignore file: {gitignore_file}')
                 self.gitignore_matcher = parse_gitignore(gitignore_file)
         self.blacklisted_extensions = config_object.get('blacklisted_extensions', [])
-        self.blacklisted_paths = [path.format(sep=os.path.sep) for path in config_object['blacklisted_paths']]
+        self.blacklisted_paths = [path.format(sep=os.path.sep) for path in config_object.get('blacklisted_paths', [])]
         self.red_flag_extensions = config_object.get('red_flag_extensions', [])
         self.max_file_size = config_object.get('max_file_size', MAX_FILE_SIZE)
         self.whitelisted_strings = config_object.get('whitelisted_strings', [])
@@ -219,9 +219,10 @@ def write_results_to_file(self):
     def run_signatures(self, file_path, content) -> Tuple[Optional[str], Optional[str]]:
         for signature in self.signatures:
             match_result = signature.match(file_path, content)
-            if match_result.matched_value:
+            if match_result.is_match:
                 if match_result.matched_value in self.whitelisted_strings:
-                    module_logger.debug(f'Signature {signature.name} matched {match_result.matched_value} but skipping since it is whitelisted')
+                    module_logger.debug(f'Signature {signature.name} matched {match_result.matched_value} but skipping'
+                                        f' since it is whitelisted')
                     continue
                 # $ Return the first signature Match.
                 return signature.name, signature.part
diff --git a/test/test_main.py b/test/test_main.py
new file mode 100644
index 0000000..1a41510
--- /dev/null
+++ b/test/test_main.py
@@ -0,0 +1,35 @@
+import unittest
+from typing import Optional
+
+from tell_me_your_secrets.__main__ import (MatchResult, Signature,
+                                           SignatureRecognizer)
+
+
+class MockSignature(Signature):
+    def match(self, file_path: str, file_content: str) -> MatchResult:
+        return MatchResult(self.is_fail, self.matched_value or '')
+
+    def __init__(self, is_fail: bool, matched_value: Optional[str] = None):
+        super().__init__('file', 'Mock Signature', 'Mock Signature')
+        self.is_fail = is_fail
+        self.matched_value = matched_value
+
+
+class RunSignaturesTest(unittest.TestCase):
+
+    def test_run_signatures_matched(self):
+        signature_recognizer = SignatureRecognizer({}, '.', False)
+        signature_recognizer.signatures.append(MockSignature(True, 'matched-yada'))
+
+        result = signature_recognizer.run_signatures('file/with/issues', 'dodgy-content')
+        self.assertEquals('Mock Signature', result[0])
+        self.assertEquals('file', result[1])
+
+    def test_run_signatures_whitelisted(self):
+        signature_recognizer = SignatureRecognizer({}, '.', False)
+        signature_recognizer.whitelisted_strings.append('matched-yada')
+        signature_recognizer.signatures.append(MockSignature(True, 'matched-yada'))
+
+        result = signature_recognizer.run_signatures('file/with/issues', 'dodgy-content')
+        self.assertIsNone(result[0])
+        self.assertIsNone(result[1])